Add cstdint #include for uint64_t

[tzik]

Description of changes:
aws/core/utils/crypto/SecureRandom.h uses uint64_t without including cstdint, that causes a compilation error on gcc-15.
This PR is adding the #include to fix the compile error.

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[sbiscigl]

to fix the compile error.

out of curiosity what platform and toolchain does this cause a failure for? more so looking for gaps in our CI

that causes a compilation error on gcc-15.

sorry you did mention

[tzik]

to fix the compile error.

out of curiosity what platform and toolchain does this cause a failure for? more so looking for gaps in our CI

that causes a compilation error on gcc-15.

sorry you did mention

I'm on Ubuntu 25.10, and using gcc-15 as it's the default compiler.
According to an announcement about gcc-15, it seems to have removed some implicit #include to stdint.h to comply a spec change.

Header dependency changes
Some C++ Standard Library headers have been changed to no longer include other headers that were being used internally by the library. As such, C++ programs that used standard library components without including the right headers will no longer compile.

In particular, the following headers are used less widely within libstdc++ and may need to be included explicitly when compiling with GCC 15:

• <stdint.h> (for int8_t, int32_t etc.) and (for std::int8_t, std::int32_t etc.)
• (for std::endl, std::flush etc.)